| 简介 |
Disclosed is a dielectric ceramic material comprising two types of crystal particles both of which are mainly composed barium titanate and which have different calcium concentrations from each other (i.e., a first crystal particle having a calcium concentration of less than 0.3 at.%; and a second crystal particle having a calcium concentration of 0.3 at.% or more). The two types of crystal particles contain vanadium in an amount of 0.1 to 0.2 mole in terms of V2O5, magnesium in an amount of 0.55 to 0.75 mole in terms of MgO, at least one rare earth element (RE) selected from yttrium, dysprosium, holmium, erbium and terbium in an amount of 0.55 to 0.75 mole in terms of RE2O3, and manganese in an amount of 0.25 to 0.6 mol in terms of MnO, relative to 100 moles of titanium which constitutes barium titanate. The crystal particles meet the requirement represented by the formula : C2/(C1+C2) = 0.5 to 0.8 [wherein C1 represents the surface are of the first crystal particle; and C2 represents the surface area of the second crystal particle. The dielectric ceramic material has a curie temperature of 85 to 95°C. |
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